Molding phonograph-records.



PATENTBD MAY 28, 1907.

v. M. HARRIS. MOLDING PHONOGRAPHREGORDS.

APPLICATION FILED 001213, 1906.

mun-um UNITED srArsf VARIAN M.- HARRIS, OF CHICAGO, ILLINOIS. MOLDING PHQNOGRAPH BECOHDS.

Specification of Letters Patent.

Patented May as, 1907.

Application filed October 13, 1906. serial N0- 388,728.

To aZZ whom it may concern.-

Be it known that I, VARIAN M. HARRI$, a citizen of the United States of America, and a resident of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Molding Phonograph-Records, of which the following is a specification.

's invention relates molding apparatus for cylindrical phonograph records, in which a blank cylinder of celluloid or the like is expanded by elastic fluid pressure and in the presence of heat into the interior of a properly formed cylindrical matrix; and the present improvement has for its object to provide a simple and efficient structural formation and combination of parts whereby a very effective sealing is at tained atthe respective ends of" the cylindrical blank during the molding operation,

' all as will hereinafter more fully appear.

In the accompanying drawings :Figure 1' is a side elevation illustrating. the general arrangement of parts of the present molding ap aratus. Fig. 2 is an enlarged central de tai section of the mold cportion, havin the present invention ap lie Fig. 3 Lee etail transverse section 0 the same, on line w-a:,

2. imilar numerals of reference indicate like parts in the difierent views.

Referring to the drawings, 1 represents the stationary supporting frameor housing of the apparatus, and which in the construction shown in the drawing comprises upper and lower horizontal memoers 2 and 3, integrally connected together by a vertical mem er 4, adapted for attachment to a Wall Ipost.

aving a or 5' is the matrix of the apparatus,

hollow cylindrical form, open at both ends,

and provided on its inner surface with sound I and adapted ,to afford strengt to the matrix in actual use; 11). improvement such she'li has; a greater len th record-indentations as usual in the present type ofmatrices'er molds.

the matrix 5, and. stiffness 6 is a' shellof metal encircling than the matrix, for the purnose hereina ter stated. v

7 is the stationar' closure head for the lower end of the mo d-or matrix aforesaid, and is supported in, a stationary condition u on the upper side of the lower member 2 of it e main frame by any usual means, referably however by, a pipe connection erein-' after described.

to that" class of spective ends 0 th .Which is fixedly the present 8 is the removableend closure head for the upper end of the mold or matrix aforesaid, of the stationary closure the upper orizontal member 3 of themain frame, and have vertical adjustment therein in a direction to and from the upper end of the matrix. 1

10 is a clamping screw fasteni end hea 8 and adjustment. 1

In the present construction the and closure heads 7 and 8are formed with taperin peripheries as shown, so as to have a wedgin fit in the interior of the respective ends of the guide stem 9 at the required cylindrical phonograph record blank 11, to

form pressure tight joints at such points.

12 arefloatin rings arranged at the ree matrix 5 in receiving cavities formed by the extensions of shell 6 beyond the matrix the fit between said ring and the described parts being a loose one to permit of the passa the practical operation of the apparatus; 13 are annular channels formed in the interior of the floating rings 12, and into which the end portions of the cylindrical phonograph record blank 11 are adapted, under the internal pressure existing in actual use,-to be found in the form of annular beads, to constitute a very efficient pressure tight joint at such points.

14 are one or more radial passages extending outward from the annual channels 13 toperrnit of the ready passa e therefrom of the air contained therein, astlie joints above referred to are forming.

15 is a vertical inlet pipe,,the' upper endof secured in a central bore in the stationary closure head 7, aforesaid.

16 is a small in th'einlet' pipe 15, an provided'with a con trolling valve 17as shown.

18 is a valved branch pipe connecting with the inlet pipe 15 and adapted tointroduce frorn'a' suitable-source a pressure of steam into the interior of theapparatus. 19 is a secondary valved branch pipe also connecting with the inlet pipe '15; and adapted to introduce from a suitable source a pressure of air for-usedn the drying", cooling and-shri k; g process, as hereinafter.

ing of the nOld' more fully set forth. v The operation of the present apparatus is or other equivalent. .means tor securing the removable ge of any confined air in The steam pressure is then shut off, and a as tollows:-The cylindrical phonograph recphonograph records, the combination of a ord blank 11 is first inserted in the interior matrix having an indented cylindrical bore,

of the matrix 5, after which the ends thereof a pair of tapering heads closing the respective are closed by the insertion of the tapering closure heads 7" and 8 to form a pressure 1 tight chamber, of which the phonograph record blank and the opposed closure heads form the encompassing walls. Steam pres- 1 sure is now admitted to said pressure cham her, to first expel the air contained therein l through the vent pipe 16, after which the valve -17 in said pipe is closed and the steam pressure maintained for a suificient eriod of time to cause a softening of the W9. ls of the phonograph record blank and the molding thereof into the indentations of the matrix 5.

supply of air introduced to dry out the interior. of the phonograph record blank, and with such drying operation effect a cooling and shrinkage of the same, so that the finished phonograph record can be readily removed for subsequent mounting upon a suit able submandrel.

Having thus fully described my invention, 5 what I'claim as new and desire to secure by Letters Patent, is z i 1. In an apparatus for molding cylindrical ends of the matrix chamber, and floating rings arranged at the respective ends 01' the matrix and provided with internal annular channels adapted to, form pressure tight joints with theendsof the cylindrical phonograph blank operated on.

2. In an apparatus for molding cylindrical phonograph records, the combination of a matrix having an indented cylindrical bore, a pair of tapering heads closing the respective ends of the matrix chamber, and floating ringsarranged at the respective ends of the matrix and provided with internal annular chambers adapted to form pressure tight joints with the ends of the cylindrical phonograph blank operated on the said grooves having radial exit passages for the escape of air therefrom.

Signed at Chicago. Illinois this 10th day of October 1906.

VARIAN M. HARRIS.

Witnesses ROBERT Bonus, HENRY ULoE. 

